Atrial Fibrillation (AFib) Support Group
Atrial fibrillation (AF or afib) is an abnormal heart rhythm (cardiac arrhythmia) which involves the two small, upper heart chambers (the atria). Heart beats in a normal heart begin after electricity generated in the atria by the sinoatrial node spread through the heart and cause contraction of the heart muscle and pumping of blood.
I would ask Pharmacist. They are so helpful!!!
http://www.mayoclinic.org/drugs-supplements/black-cohosh/interactions/hrb-20058861
I'd talk to the doc that has you on the thinner.